Carburetor



F. DAY

June 7,1927. 1,631,923.

CARBURETOR Filed March 1, 1924 2 Sheets-Sheet l INVENTOR WITNESS: ATT RNY Patented June 7, 19 27 gu m Bur-ES FRED DAY, or, Amman, SOUTH'DAKOTA;

. tion B, and the gasolinepassing NT OFFICE cnuwim'ron.

Appl ication filed March. 1;. 1924. snal No. ceases. I I

This: invention relates. :to carburet orspand ,tllQkOl'JjQCt is toprovide a particulareecontml .ot the valvesby the float, and byreasonlof (JOI'lllQj'tiOllS permitting reduced air pressure,

under, theconditions disclosed in the descri rv tion of, theconstruction in; detail. 7

A .turtlie1' object is toprovide an apparatus making unnecessary, theuse of a separate vacuunitanli.

11With the foregoing and other objects in view the invention. consistsin the novel construction and;arrangement. of elements; described,illustrated, and claimed, it being un-- derstood thatn]O(1lfiC21tlOnS;I1lfly bemade withintlie scope of the claims withoutdepartingifrom the spirit of the, invention.

Tn tliemliawings,Figure liis a view of the-carburetor in verticalsection; Figure2 is a eectionof thehand operated eleu'ientdorcontrolling needle valve 88; Figure 3 is a detail view showing a portthrough the wall of chamber 63 at. the lowerrighthand portion of: Figure1; Figure 4 is; a section. on line 49 l. of Figure 1; Figure 5 is asection on line 5 5 of Figure 4. i v

The, main casing, includes. theaupper section A and a lowersection B,these sections being connected at C3, and taperedportionH of the uppersection fitting the lower section atyH, where there is a correspondingtaper adj acent to the air inlet valve 66 reterred to below. Afloatchamber having Walls 11 is spaced'above the shell of the lower seefromthe float chamber into the bottom 0 section B enters the mixing chamberthrough the path .to .bedescribed in more detail. Sediment is drainedoff when requiredgat D; Gaskets E, F, G are located as shown,.to preventleakage. i y

Float 12 isrigid with stem .13 'havinga bore 1 L in its lower endloosely fitting the ireduced end 15 of a screwi lti holdinga looselymounted disk valve 17. ,M'lhi's valve 17 closes ports 18 through whichgasolinepasses from chamber 10 to the bottom B ofsectionB. Disk valve 17loosely fits bore 19 and screw 16 isprovided. with a shoulder 19", toprevent itwiirom being screwed u against the valve. A gasolineintakezduct20, is connected with cap 21 ofchamber 21, the ca having an'angular" portion (Fig. .2) ,y or' engagement by atool, and duct-20eommunicates with chamber 21- in which screen 22 is mounted. ;T he fuelpasses through ort 23 to cha1nber.24,and tOVfllVQ cham er 25.

closed by a valve 26. This valve isitria'ngu- 'lar 1n cross section, hasa tapered, endseating at .27, and a-rounded lower end engaged by arm 28pivoted at' 29. .The. arm is engaged air displacedby the gasoline'topass out,

so that the passageoftuel around valved? will not be obstructed.()verflow port I? at the right of Figure 1 prevents an. overchargeoflgasoline, any lowedtorun ofil- Alarge .valve 33 is slidablevertically on.

the stem 13 and loosely fits casing or Challiber 34. This valve includestubular por- .tion 35 having an internalishoulder 36 engaged by coiledspring 37.1ocatedbetween raise the valve. 1 i 7 Valve 33 has anupperbore 39.. loosely receivinga valve,4l0 seated. at A1 and ,co ntrolling. the admission-of air. through ports '60 by. disk 30 on stem 13of the float. Port P :ofzFig. 6 leads from chamber 63, and allowssurplus beingi'ral- 7 42, here 39 and; ports 43:i11..tuhular portion 1.35. .IValve 40 issquare..in1 .cross section,

hasan upperslot l l for engagement by a tool inserted through an openingaclosedv by cap 45 and thisvalve is threaded on to'the upper end of stem13.

- .alve'133 seats at 33 having an wlIpPQI. flange 46 controlling thepassage around the valveat the upperendo valve chamber ,34. Below cap;45is a chamber48 incommunication with the outerair;through ports: 42.

In the side of valvechamber '3Lis aport 49 communicating byJneans-ofductor tube 50 with housing 51 of throttlevalve52; and on the sidetoward the engine. The stem 53 of this valve iscontrolled byitlllll :54,and

a short, arm 55 contacts 1witlr'a screw 56 mounted in lug 57-andconstituting an :ad-

.justable stop for the valve.

The main air intake 60 lSdIl/COlDlnUl'llCfltion with chamber 615 partlyirounded ns shown, and separated :by diaphragm 62 from lower chamber,163 inlower casing el ement Between; chamber 61 and mixing chamber 64is; a valve seat 65 where a main valve 166 seats. This valve includescylindrical portions 67, .68, the latterihavingports 69.leading ,to:chamber 6% and having threaded connection with; theuppe'r end of stemIOpro+ vided. wi h alpns d m her .7 .A Por 72 leads from this bore tospace Y71 and registering ports 73, 74-. lead to space 75 betweencylindrical portion 67 and sleeve 7 6 having a reduced upper endthreaded to stem 71. This sleeve 76, is concentric with stationarycylindrical element- 78 on dia-' phragm 62, and element 78 guides stem71, as well as the sleeve.

A stationary tubular member 80 incloses the lower part of stem 70, and aplug sleeve 81 is threaded into member 80, passing through the bottom13. Elements 80 and 81 have registering ports 82, 83 permitting gasolineto enter the lower-end of hollow stem 70 and pass upwardly to port 72.The lower end of stem 70 is smaller than sleeve 81 and includes a spiralrib 8 1 engaging stationary washer 85 and preventing vibration of thestem vertically.

Needle valve 88 controls port 72 in hollow stem 70 and is mounted incylindrical member 89 having an upper flange engaged by coiledexpansion-spring 90 hearing on member 68 of valve 06. A controlling wire91 engages member 89 and passes through tube 92 entering a plug sleeve93 threaded into casing member A and retained by nut 9%. Element orplunger 89 operates in bore 95 of member A of the casing. "he tube 92 isretained by cap 96 threaded on to the end of sleeve 93 and acting tocompress \vasilher 97 against the tube. Element 93 has fiat sides at onepoint, to permit of adjustment by a wrench. 7

Wire 91 is operated by knob or disk 100 rigid with stem 101 slidable insleeve 102, the Wire being retained in the stem b Y set screw 103 whichforces the Wire into recess 104;. The head of the screwl03 engages astud 105 under the action of spring 106, preventing displacement of thestem. A channel 107 in the stem permits the movement of the latter withreference to the stud and provides a guide. Tube 92 is connected withsleeve 102,;in the manner shown at 108, the conn'ectionbeing similar tothat at the other end of tube 92.

Needle valve 88 is therefore controlled by pressure or knob 100, by theoperator,tl1e movement being transmitted through spring Wire 91. Theneedle valve being gradually tapered as shown, permits of delicatecontrol of port 72, admitting fuel.

Assuming that float 12 is down, valves 33 and 410 are closed, and thecarburetor requires more gas0line,engine suction through port 49 willdraw in fuel through screen 22, and, it will pass open valve 26 to floatchamber 10, the suction in the" latter holding lower valve-1'7 closedfor the time.

Suflicient gasoline havingjentered, float 12 will rise, valve 26 willclose, and small valve 10 on the stem of the float will open because ofthe rise of the float. Air will then pass through ports 42 and chamberl8,

through the bore around valve 40, and through ports 43 to chamber 10,The resulting elimination of suction will permit large valve 33 to riseunder the action of its spring. Engine suction is however too strong topermit valve 33 to rise until air has entered through small valve 40 andreieved the suction, partially.

Suction on lower valve 17 being relieved, that valve Will drop to openposition, and allow gasoline to flow to B, and thence to ports 82,83,'and up through hollow stem 70. 1

After passing port 72 in stem 70 (the port being controlled by needlevalve 88), the gasoline is mixed with air entering at 73, .741, 7 5,'themixture emerging through ports 69 into chamber 6 1, where it is furthercombined with air entering at 65 and passing large valve 66. Fromchamber 64: the fuel passes throttle valve 52 to the engine, and thespeed of the latter and the suction produced determines the extent ofopening of valve 60. 88, or tlie'reduced end thereof permits moregasoline to pass port 72, to meet the demands of the engine. Forpriming, pressure on knob 100 produces thrust on elements 91, 89 and 88for the purpose desired.

\Vhat IIclaim is: e

11. In a device of theclass described, a float chamber, a float therein,a reduced air pressure connection for the chamber, a fuel inlet and anair inlet for the chamber, a tubular air inlet valve, a stem for the,float,

said stein passing through the valve, a valve 2 on the stem controllingthe passage'of air throu 'h the tubular valve to the chamber,

lVhen valve 66 rises, needle valve and controlling the movement of thetubular valve in one direction, and a spring for opening the tubularvalve and admitting additional air to the chamber after the tubularvalve has been released by the valve on the stem; y

2. In a carburetor, a float chamber, a float therein, a reduced airpressure connection for the chamber, a fuel inlet and an air inlet forthe chamber, a tubular air inlet valve, a stem for the float, said stempassing thru the valve, a valve on the stem controlling the passage ofair thru the tubular valve to the chamber and controlling themovementlof the tubular valve in one direction, a spring for opening thetubular valve and admitting additional air to the chamber after thetubular valve has been released by the valve on the stem, means forclosing the fuel inlet valve upon the lifting of the float and stem, andmeans operated by the stem controlling the passage of fuel from thefloat chamber.

In testimony whereof I allix my signature.

FRED DAY.

